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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a39273baffc3f8561e11803a3e3e27b5fb3c3e87542db692c5ec3266f6666f9' 
  AND token = '5C0LN0vKPCkoCsIRkL/asLqmQoN4wgA7iIQw3OMrVwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}